An Indonesian Mystery Knife

[CharlesS]

Here is an interesting Indonesian mystery knife whose hilt appears Sumatran(???), but with a strange downturned, diamond-sectioned, blade of about 10 inches.

Any ideas as to a more precise origin, or its use???

Among Indo Persian weapons kards are occasionally found with distinctly downturned blades.

Could both have a korambi, claw-like, use??